/*
 * Copyright (C) 2010 Michael Baranczak.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.pocketgorilla.stripesem;

import javax.servlet.ServletContext;
import net.sourceforge.stripes.action.ActionBean;
import net.sourceforge.stripes.action.Resolution;
import net.sourceforge.stripes.controller.ExecutionContext;
import net.sourceforge.stripes.controller.Interceptor;
import net.sourceforge.stripes.controller.Intercepts;
import net.sourceforge.stripes.controller.LifecycleStage;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/** Injects JPA dependencies into Stripes ActionBeans.
 *
 * @author Mike Baranczak
 */
@Intercepts(LifecycleStage.HandlerResolution)
public class JPAInterceptor implements Interceptor {


    private static Log log = LogFactory.getLog(JPAInterceptor.class);

    protected JPAProvider provider;

    @Override
    public Resolution intercept(ExecutionContext executionContext) throws Exception {
        if (provider == null) {
            ServletContext servletContext = executionContext.getActionBeanContext().getServletContext();
            provider = JPAProvider.getProviderForApplication(servletContext);
        }
        ActionBean bean = executionContext.getActionBean();
        if (log.isDebugEnabled()) {
            log.debug("intercepting "+bean.getClass().getName());
        }
        provider.inject(bean);
        return executionContext.proceed();
    }

}
